# MariaL7

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• EmmanuelE21 commented on MariaL7's instructable Low Cost Spirometer1 day ago

How sensor you finaly use¡? i bougth an mpx5700 but is a 100psi sensor :/

• number251 commented on MariaL7's instructable Low Cost Spirometer1 week ago

may I Look Spirometer Code That your created.

may I look spirometer code that you created

Can you explain how you used the following formula in the code?pressure_psi = (15/2)*(volt-2.492669); // Pressure in psiHow did you get 15/2?

• Blasters followed MariaL72 months ago
• Pierpa_76 commented on MariaL7's instructable Low Cost Spirometer2 months ago

The pins are identical ARDUINO based on version 3 as well ? I bought the complete form and thanks to this project I want to try for the first time Arduino . Hello and thanks.

• anim2016 commented on MariaL7's instructable Low Cost Spirometer5 months ago

you need to check the datasheet of the differential pressure sensor you are using. It depends on the manufacturer but it should be there for all of them. In the datasheet the author attached (honeywell-sensing-asdx-series-analog-pressure-sensors-product sheet-008090-12-EN.pdf) is the one highlighted in the attached picture.Replacing the values in the ecuation you should get: pressure_psi = (15/2)*(volt-2.492669)It's a simplified mathematical version. (e.g.: in the graph you see Pmax and Pmin 5% and 95% etc etc.. and you replace the values accordingly in the ecuation)

• anim2016 commented on MariaL7's instructable Low Cost Spirometer5 months ago

Hi, Please see picture for the pitot tube design.The pitot tube is a device to measure the local velocity along a streamline. The pitot tube has two tubes: one is static tube(b), and another is impact tube(a). The opening of the impact tube is perpendicular to the flow direction. The opening of the static tube is parallel to the direction of flow. The two legs are connected to the legs of differential presure senzor for measuring small pressure differences. The static tube measures the static pressure, since there is no velocity component perpendicular to its opening. The impact tube measures both the static pressure and impact pressure (due to kinetic energy). In terms of heads the impact tube measures the static pressure head plus the velocity head.

Hi, Please see above my explanation. It's not a spirometer tube it's a pitot tube. The device is called spirometer

• nasyun24 commented on MariaL7's instructable Low Cost Spirometer5 months ago

anim2016, can i ask you one more question hihi sorryy .. what did she meant by . "There is an equation included in the data sheet than can be used to calculate the pressure based on the output voltage." which equation in the datasheet that she manipulated to calculate the pressure?

• x0900 followed MariaL75 months ago
• anim2016 and nasyun24 commented on MariaL7's instructable Low Cost Spirometer5 months ago

Thanks a lot for your explanations :) Really appreciate it! - nasyun24

hi anim2016, I also working on making spirometer for my group project but we get confused on the spirometer tube design. can you show how you do it? thank you very much! - nasyun24

it's a pitot tube. bassically you need a tube open at both ends. you then shrink the diameter of the half of the tube ( i did it by inserting another tube inside); you make two holes, one where the diameter is not shrunk and one where the diameter is shrunk. it's a bit diffcult to explain. it's a simplifice version, just search pitot tube and you will understand - anim2016

• number251 commented on MariaL7's instructable Low Cost Spirometer6 months ago

Hi, anim2016 nice to meet youi am appreciation for your made it,I am also learning to make these tools but my difficulty with the spirometer tube design.if you allow allow me know how you make the spirometer tube.Thanks

• LucaR18 followed MariaL76 months ago
• LucaR18 commented on MariaL7's instructable Low Cost Spirometer6 months ago

Hello Maria! Very nice project!I am very interested to your project because I am a free diver an I would like to measure the pulmonary capacity variation with different kind of breath techniques.Which sensor p/n did you used? How is precise? Thanks! ;)

• M3lvin followed MariaL77 months ago
• SurduM commented on MariaL7's instructable Low Cost Spirometer7 months ago

Hi MariaL7! Congrats for your project!I have a question and i will thank you very much if you can let me an answer.Can you show me a model of that tube? I push the air in that tube and i see the air is going to sensor on .The sensor have an out for the air? Thanks for your time !

• wajahata5 followed MariaL78 months ago